Vickers. Check Valves. Check Valves. Inline, right angle, manifold mounted, and pilot operated designs. Released 9/93

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1 Vickers Check Valves Check Valves Inline, right angle, manifold mounted, and pilot operated designs Released 9/93 645

2 Introduction Vickers inline, right-angle, and manifold mounted check valves are direct operated and used in hydraulic circuits to allow the free flow of fluid in one direction only. The graphical symbol for these valves is a spring-loaded ball and a seat, as shown below. Direct operated Pilot operated valves, like direct operated valves, permit free flow in one direction and prevent flow in the reverse direction. However, pilot operated valves permit reverse flow when a pilot pressure signal is applied to the valve s pilot port. The graphical symbol for these valves is shown below. Pilot operated valves have very low internal leakage and are typically used to lock a cylinder in place until the main directional valve shifts. Free flow No flow Pilot Operated A light spring holds the valve poppet in its normally closed position. The valve starts to pass fluid at a pressure equivalent to the spring cracking pressure level. Various spring (cracking) pressures are available to suit aplication requirements. All except inline models can be used for high velocity flows resulting in shock conditions. Inline models are designed for low shock service.inline check valves can be used as a safety bypass for flow surges through filters and heat exchangers. With a higher spring rating, they can also be used as a means of generating pilot pressure. Pilot In Out Note: Vickers also has a range of SAE flange mounted check valves, and ISO and -05 stackable check valves. Flange mounted models are described in publication 627. Size -03 and -05 stackable models are described in publications GB-C-2027 and GB-C-2022, respectively. Right angle check valves are designed for higher flows with less pressure drop. The valves seat and poppet are of hardened and ground steel for improved cycle life. An orifice plug can be placed in the poppet to permit a restricted flow through the valve in its normally closed position; as such, these valves are typically used in controlling the rate of decompression in a large press before shifting the main valve. 2

3 Table of Contents Inline Check Valves Code Ratings and Specifications Pressure Drop Installation Dimensions Typical Applications Right Angle Check Valves Code Ratings and Specifications Installation Dimensions Manifold Mounted Check Valves Code Ratings and Specifications Pressure Drop Installation Dimensions Pilot Operated Check Valves Code Pilot Area and Cylinder Ratios Ratings and Specifications Installation Dimensions Application Data, Ordering, and Service Hydraulic Fluids Seals Mounting Position Port Connections Fluid Cleanliness Ordering Service Information 3

4 Inline Check Valves Code D*8P1 - ** - ** - 1* Series DS8P1 SAE straight treaded ports DT8P1 NPTF pipe threaded ports 2 Nominal Size (in inches) 02 1/4 (not available in DS8P1 series) 03 3/8 06 3/ /4 3 Cracking Pressure 5 0,35 bar (5 psi) 30 2,0 bar (30 psi) 65 4,5 bar (65 psi) 4 Design Number 10 For 02 and 03 size 11 For 06 and 10 size Subject to change. Installation dimensions remain unchanged for designs 10 through 19. Ratings and Specifications Series DT8P1-02 D*8P1-03 D*8P1-06 D*8P1-10 Maximum Operating Presure bar (psi) Flow Capacity l/min (USgpm) 12 (3.2) 30 (8.0) 75 (20) 200 (50) Using hydraulic oil with viscosity rating of 32 cst (150 SUS) at 38 C (100 F). Approximate Weight kg (lb) 0,10 (.50) 0,34 (.75) 0,68 (1.5) 2,70 (6.0) Pressure Drop Pressure drop psi D*8P1-03 Pressure Drop Across D*8P1-**-5-1* s D*8P1-06 D*8P1-10 2,1 1,4 0,7 Pressure drop bar Flow rate USgpm l/min 4

5 Installation Dimensions Millimeters (Inches) Free Flow CAUTION: Do not use this valve to check a high velocity reverse flow resulting in shock conditions. (See typical applications below.) Where such conditions exist, Vickers C2-8** or C5G-8** type check valve should be used. Inlet connection. S straight threads or T NPTF pipe threads A B Outlet connection. S straight threads or T NPTF pipe threads Series A B DT8P1-02 D*8P1-03 DT8P1-06 DS8P1-06 D*8P ,2 (2.25) 76,2 (3.00) 98,6 (3.88) 104,0 (4.09) 134,4 (5.25) 22,4 (0.88) 25,4 (1.00) 38,1 (1.50) 38,1 (1.50) 63,5 (2.50) S Straight Thread UNF-2B UNF-2B UNF-2B UNF-2B T NPTF Pipe Thd. 1/4 3/8 3/4 3/4 1-1/4 Typical Applications D*8P1 Inline Check Valve Can Be Used Heat exchanger Reciprocating motion with over-running loads, either direction High inertia reversing load Tank D*8P1 inline check valve, free flow Deliveryfrom pump Directional valve To hydraulic system Deliveryfrom pump Tank D*8P1 inline check valve, free flow C2-8** right angle check valve C2-8** or C5G-8** Type Check Valve Should Be Used Accumulator To hydraulic system C2-8** right-angle check valve To hydraulic system Free flow Directional valve To hydraulic system Pressure adjustment Free flow Deliveryfrom pump Unloading relief valve Discharge to tank Pump 5

6 Right Angle Check Valves Code C 2 (S) - 8 ** - (***) Check Valve 2 Design Number Subject to change. 3 Port Threads Blank NPT threads S Straight threads 4 5 Right Angle Type Valve Port Size 00 1/4 NPT 05 3/8 NPT or UNF-2B (.500 tubing) 15 3/4 NPT or UNF-2B (.750 tubing) 20 1 NPT /4 NPT or UNF-2B (1.250 tubing) /2 NPT 35 2 NPT 6 Cracking Pressure Blank 0,3 bar (5 psi), standard S2 2,4 bar (35 psi) S3 3,4 bar (50 psi) S8 5,2 bar (75 psi) S12 0,3 bar (5 psi) and plug in poppet. (See view below.) S bar (125 psi) S19 1,4 bar (20 psi) Solid plug (Can be drilled to suit orifice requirement) Construction of S12 Cracking Pressures Ratings and Specifications Maximum Operating Nominal Pressure Flow Capacity Series bar (psi) l/min (USgpm) C2-800 C2(S)-805 C2(S)-815 C2-820 C2(S)-825 C2-830 C (3) 25 (6) 60 (16) 100 (28) 170 (45) 250 (65) 400 (100) Using SAE 10W Oil at 49 C (120 F) Approximate Pressure Drop at Rated Flow bar (psi) 1,2 (18) 1,4 (20) 1,4 (20) 1,0 (14) 1,0 (14) 1,6 (23) 1,4 (20) Approx. Weight kg (lb) 1,4 (3) 1,4 (3) 2,3 (5) 3,6 (8) 4,8 (10.5) 4,8 (10.5) 12,2 (27) 6

7 Installation Dimensions Millimeters (Inches) F E D A C B Inlet port. S straight thread or P NPTF pipe thread C Outlet port. S straight thread or P NPTF pipe thread Series C2-800 C2(S)-805 C2(S)-815 C2-820 C2(S)-825 C2-830 C2-835 P Pipe S Straight Thread Thread A B C D E F UNF-2B UNF-2B 1/4 NPT 3/8 NPT 3/4 NPT 1 NPT 74,7 (2.94) 74,7(2.94) 98,6 (3.88) 115,8 (4.56) 26,1 (1.03) 26,1 (1.03) 44,4 (1.75) 46,7 (1.84) 31,8 (1.25) 31,8 (1.25) 50,8 (2.00) 57,1 (2.25) 53,8 (2.12) 53,8 (2.12) 69,8 (2.75) 82,6 (3.25) 31,8 (1.25) 31,8 (1.25) 46,0 (1.81) 57,1 (2.25) 58,7 (2.31) 58,7 (2.31) 81,0 (3,19) 98,6 (3.88) UNF-2B 1-1/4 NPT 138,2 (5.44) 66,5 (2.62) 76,2 (3.00) 82,6 (3.25) 66,5 (2.62) 107,9 (4.25) 1-1/2 NPT 138,2 (5.44) 66,5 (2.62) 76,2 (3.00) 82,6 (3.25) 66,5 (2.62) 107,9 (4.25) 2 NPT 187,4 (7.38) 73,1 (2.88) 88,9 (3.50) 114,3 (4.50) 91,9 (3.62) 149,3 (5.88) Using SAE 10W Oil at 49 C (120 F) 7

8 Manifold Mounted Check Valves Code (F3) - C 5 G - 8 ** - (**) Special Seals See Seals section on page 15. Omit for standard seals. Check Valve 3 Design Number Subject to change. 4 5 Subplate or Manifold Mounted Nominal Size 805 3/8 pipe or 1/2 tube 815 3/4 pipe or 3/4 tube /4 pipe or 1-1/4 tube 6 Cracking Pressure Blank 0,3 bar (5 psi), standard S3 3,4 bar (50 psi) S8 5,2 bar (75 psi) Ratings and Specifications Series C5G-805 C5G-815 C5G-825 Maximum Operating Pressure bar (psi) Nominal Flow Capacity l/min (USgpm) 40 (10) 75 (20) 400 (100) Approximate Weight kg (lb) 1,2 (2.7) 2,9 (6.5) 6,1 (13.5) Pressure Drop Pressure Drop for Free Flow Across Check Valve Series C5G-805 C5G-815 C5G-825 Flow Rate l/min (USgpm) 18,9 (5) 37,8 (10) 56,8 (15) 75,7 (20) 37,8 (10) 75,7 (20) 113,6 (30) 151,4 (40) 94,6 (25) 189,3 (50) 283,9 (75) 378,5 (100) 473,2 (125) P bar (psi) 0,9 (13) 1,2 (17) 1,5 (22) 1,9 (27) 0,5 (7) 1,0 (15) 1.7 (25) 2,4 (35) 0,6 (8) 0,8 (12) 1,1 (16) 1,5 (22) 2,1 (30) 1. Figures in the chart at left give approximate pressure drops ( P) when pasing 21 cst (100 SUS) fluid having.865 specific gravity. 2. For any other viscosity, pressure drop ( P 1 ) will be: Viscosities cst (SUS) 14 (75) 32 (150) 43 (200) 54 (250) 65 (300) 76 (350) 86 (400) % of P (Approximate) For any other specific gravity (G 1 ), pressure drop ( P 1) will be approximately: P 1 = P (G 1 /G). (Obtain specific gravity figure from fluid producer; figure will be higher for fire-resistant fluids than for oil.) 8

9 Installation Dimensions C5G-805 Series Millimeters (Inches) Mounting Bolt Kits Mounting bolts must be ordered separately. Example: One (1) C5G-805 Check Valve One (1) BKCG Bolt Kit Bolt thread size is , and bolt length is 1.75 (both in inches). Maximum bolt torque is 35 Nm (26 lbf. ft.). Mounting bolts, when provided by customer, must be SAE grade 7, or better. 22,3 (.88) 33,3 (1.31) 2 locating pins. See mounting pad for location dimensions. 6,3 (.25) 6,3 (.25) 33,3 (1.31) 3 (.12) 65,8 (2.59) Inlet port Mounting surface R 8,6 (.34) 65 (2.56) 47,7 12,7 (.50) 7,92 (.312) hex. 77,7 (3.06) 60,4 (2.38) Direction of oil flow Outlet port 10,72 (.422) thru 17,5 (.69) spotface 4 holes for mounting Mounting Pad A machined pad, as indicated by shaded area, must be provided for mounting. Pad must be flat within 0,013 mm (.0005 in.) and smooth within 1,6 micron (63 microinch). 47,8 R 8,6 (.34) Outlet conn UNF-2B thread. 4 holes (Valve mtg.) 60,4 (2.38) 77,7 (3.06) 7,14 (.281). 7,9 (.31) deep. 2 holes (For locating pins) 30,2 (1.19) 12,7 (.50) 65 (2.56) 23,9 (.94) 47,8 14,68 (.578) 2 places Outlet connection 9

10 Installation Dimensions C5G-815 and C5G-825 Series Millimeters (Inches) Mounting Bolt Kits Mounting bolts must be ordered separately. 6,4 (.25) 2 places 6,4 (.25) Valve Series C5G-815 C5G-825 Bolt Kit BKCG BKCG Bolt Thd. Length inch inch Maximum bolt torques are 47 Nm (35 lbf. ft.) and 95 Nm (70 lbf ft.) for and bolts, respectively. Mounting bolts, when provided by customer, must be SAE grade 7, or better. E F Hex. G Mounting Pad A machined pad, as indicated by shaded area, must be provided for mounting. Pad must be flat within 0,013 mm (.0005 in.) and smooth within 1,6 micron (63 microinch). T thread. 4 holes for mounting valve. Outlet connection Inlet connection Direction of oil flow N A P U Radius V A N P S B L R Q R M L B D C Mounting surface (Seals furnished) Radius V H thru. J counterbore - K deep. 4 holes for mounting (NOTE: J is spotface for C5G-825) W 7,14 (.281). 7,8 (.31) deep. 2 holes (For rest pins) Series A B C D E F G H J K C5G ,8 (3.81) C5G (5.00) 112,8 (4.44) 127 (5.00) 76,2 (3.00) 110,2 (4.34) 11,2 (.44) 10,4 (.41) 41,1 (1.62) 47,7 50,8 (2.00) 66,5 (2.62) 38,1 (1.50) 57,9 (2.28) 16,66 (.656) 19,84 (.781) 25,4 (1.000) 30 (1.18) Series L M N P Q R S T U V W C5G (3.19) C5G ,9 (3.62) 40,4 (1.59) 46 (1.81) 65 (2.56) 91,9 (3.62) 32,5 (1.28) 46 (1.81) 68,3 (2.69) 71,4 (2.81) 22,3 (.88) 20,6 (.81) 23,01 (.906) 34,92 (1.375) UNC-2B UNC-2B 8,6 (.34) 9,6 (.38) 15,7 (.62) 17,5 (.69) 15,7 (.62) (.906) 28,6 (1.125) 10

11 Pilot Operated Check Valves Code (F3) - 4C * - ** - (D) * - 2* Special Seals See Seals section on page 15. Omit for standard seals. 2 3 Check Valve Mounting Type G Manifold or subplate S SAE straight thread T NPTF thread 4 Nominal Valve Size 03 3/8 pipe or 1/2 tubing 06 3/4 pipe or 3/4 tubing /4 pipe or 1-1/4 tubing 5 Decompression Poppet D With decompression. Omit if not required. (See Pilot Area and Cylinder Ratios section below.) 6 Cracking Pressure A 2 bar (30 psi) C 5 bar (75 psi) F 10 bar (150 psi) 7 Design Number 20 For 4CG models 21 For 4CS and 4CT models Subject to change. Installation dimensions remain unchanged for designs 20 through 29. Pilot Area and Cylinder Ratios The ratio between a check valve s pilot pressue area and poppet area must be greater than the ratio between a hydraulic cylinder s piston and annulus areas. If it is not, the valve will not open to permit reverse flow. For example, if the cylinder has a piston-to-annulus area ratio of 2:1, the valve must have a greater (3:1) ratio. Ratings and Specifications With large check valves or large differential-area cylinders, the valve s ratio may be difficult to acieve. For these cases, a decompression-type check valve, which can have an opening ratio of 30:1 or greater, can be used. A decompression poppet (within the main poppet) is much smaller than the check valve s pilot piston and is seated Maximum Area Ratio Operating Nominal Pilot Piston Area Pressure Flow Rating to Decompression Pilot Piston Area to Series bar (psi) l/min (USgpm) Poppet Area Check Valve Area 4C*-03-A 4C*-03-C 4C*-03-F 4C*-06-A 4C*-06-C 4C*-06-F 4C*-10-A 4C*-10-C 4C*-10-F 50 (12) 50 (12) 50 (12) 100 (30) 100 (30) 100 (30) 300 (75) 300 (75) 300 (75) 30:1 30:1 30:1 48.2:1 48.2:1 48.2:1 77:1 77:1 77:1 3.11:1 3.11:1 3.11:1 3.12:1 3.12:1 3.12:1 2.6:1 2.6:1 2.6:1 1,7 (25) 1,7 (25) 1,7 (25) 2,7 (40) 2,7 (40) 2,7 (40) 3,4 (50) 3,4 (50) 3,4 (50) Approximate pressure drop at rated flow. Valve held open by pilot pressure. Free flow across poppet. in a through hole in the pilot-piston end of the main poppet. The decompression poppet opens first, reducing the pressure behind the main poppet that is holding the main poppet closed. When this pressure is low enough, the pilot piston pushes the main poppet into the open position to allow full reverse flow. Pressure Drop bar (psi) 3,8 (55) 6,2 (90) 13,1 (190) 4,5 (65) 9,0 (130) 15,8 (230) 3,4 (50) 8,3 (120) 13,8 (200) C in Formula Below Formula Pilot pressure to crack decompression poppet or check valve: P Out P In Pilot Pressure = + P In + C Area Ratio Where: P Out = Pressure at free flow outlet P In = Pressure at free flow inlet C = Figure from chart above Directional Valve Compatibility Directional valves with their cylinder ports open to tank in the center position (Vickers spool types 0, 6, 9, and 33) are recommended for use with 4C* series check valves. 11

12 Installation Dimensions 4CG Series Millimeters (inches) Free flow outlet or reversed controlled flow inlet (Use gage conn. number 1) Port not used 6,3 (.25) Radius J G F Pressure gage conn. no UNF straight thread Pressure gage conn. no UNF straight thread Pilot control connection AB 6,3 (.25) rest pin furnished ( See mounting pad dimensions for spacing) Mounting surface (Seals furnished) E D E Free flow inlet or reversed controlled flow outlet (Use gage conn. number 2) D A 10,31 (.406) thru. 15,09 (.594) counterbore to depth shown. H holes (See mounting pad dimensions for spacing) C Series A C D E F G H J AB 4CG-03 68,1 (2.68) 4CG-06 78,5 (3.09) 4CG ,1 (3.94) 36,6 (1.44) 41,4 (1.63) 50,8 (2.00) 43,7 (1.72) 50,8 (2.00) 58,7 (2.31) 28,4 (1.12) 35 (1.38) 47,7 39,6 (1.56) 55,6 (2.19) 54,9 (2.16) 122,2 (4.81) 171,7 (6.76) 193,5 (7.62) 4 10,4 (.41) 4 11,2 (.44) 6 10,4 (.41) 55,9 (2.20) 68,6 (2.70) 90,2 (3.55) Approx. Weight kg (lb) 3,6 (8) 6,8 (15) 11,8 (26) 12

13 Installation Dimensions Subplates and Bolt Kits for 4CG Valves Millimeters (inches) Valve Series 4CG-03 4CG-06 4CG-10 Subplate RXGM-03S-20 RXGM-06SX-20 RXGM-10S-30 Bolt Kit BKRX BKRX BKRX M DD N EE P Bolt Kit BKRX BKRX BKRX Bolt Thread Size Length inch inch inch Valves, subplates, and mounting bolts must be ordered separately. When subplate is not used, machined pad must be provided for mounting. Pad must be flat within 0,013 mm (.0005 in.) and smooth within 1,6 micron (63 microinch). Mounting bolts, when provided by customer, must be SAE grade 7, or better. V MM RR L UNC-2B thd. CC mounting holes PP KK JJ GG U BB Z T AA K straight thread (from reverse side) 2 holes HH 10,31 (.406) thru. 15,09 (.594) c bore 9,6 (.38) deep. 4 holes LL X Y R 7,14 (.281). 7,9 (.31) deep. For rest pin UNF-2B thread (from reverse side) ** RXGM 03 and -06 use 4 valve mounting bolts. RXGM-10 uses 6 bolts. FF - 2 holes Radius S - 2 places Radius W Port not used Subplate K RXGM-03S UNF-2B RXGM-06SX UN-2B RXGM-10S UN-2B Tube O. D. L M N P R S T U V W X Y Z 1/2 25,4 (1.00) 1 31,7 (1.25) 1-1/4 47,7 19 (.75) 19 (.75) 22,3 (.88) 63,5 (2.50) 73,1 (2.88) 79,2 (3.12) 127 (5.00) 146 (5.75) 158,7 (6.25) 76,2 (3.00) 117,3 (4.62) 146 (5.75) 23,9 (.94) 39,6 (1.56) 47,7 43,7 (1.72) 50,8 (2.00) 58,7 (2.31) 87,4 (3.44) 101,6 (4.00) 117,3 (4.62) 63,5 (2.50) 82,5 (3.25) 104,6 (4.12) 10,4 (.41) 11,2 (.44) 10,4 (.41) 35,8 (1.41) 49,3 (1.94) 67,6 (2.66) 42,9 (1.69) 60,4 (2.38) 84,1 (3.31) 25.4 (1.00) 33,3 (1.31) 44,4 (1.75) Subplate AA BB CC DD EE FF GG HH JJ ** KK LL MM PP RR NFPA Interface P03 RXGM- 03S-20 RXGM- 06SX-20 RXGM- 10S-30 33,3 (1.31) 39,6 (1.56) 48,5 (1.91) 66,5 (2.62) 79,2 (3.12) 96,8 (3.81) 4 53,1 (2.09) 4 62 (2.44) 6 69,1 (2.72) 106,4 (4.19) 123,9 (4.88) 138,2 (5.44) 14,2 (.56) 23,1 (.91) 28,4 (1.12) 21,3 (.84) 20,6 (.81) 24,6 (.97) 28,4 (1.12) 38,1 (1.50) 50,8 (2.00) 31,7 (1.25) 44,4 (1.75) 42,2 (1.66) 62,7 (2.47) 4,8 (.19) 6,3 (.25) 7,9 (.31) 38,1 (1.50) 53,8 (2.12) 76,2 (3.00) 6,3 (.25) 17,5 (.69) 20,6 (.81) 10,4 (.41) 11,2 (.44) 10,4 (.41) Approx. Weight kg (lb) 1,5 (3.25) 2,9 (6.50) 5 (11) P06 P10 13

14 Installation Dimensions 4CS and 4CT Series Millimeters (Inches) P sq. L K Q - 3 places N R wrench flats 3 places M F A J H Free Flow Inlet or Reversed Controlled Flow Outlet System connections. S or T thread. 3 places Optional- Free Flow Inlet or Reversed Controlled Flow Outlet (Use gage conn. no. 2) E Free Flow Outlet or Reversed Controlled Flow Inlet (Use gage conn. no. 1) B C Pressure gage conn. number UNF str. thd. for 1/4 O. D. tubing Pressure gage conn. number UNF str. thd. for 1/4 O. D. tubing A D Pilot control connection UNF-2B Series A B C D E H J K L 4C*-03 57,1 (2.25) 4C*-06 70,1 (2.76) 4C*-10 95,2 (3.75) 24,1 (.95) 31,7 (1.25) 29,2 (1.15) 45,2 (1.78) 57,1 (2.25) 77,8 (3.10) 28,4 (1.12) 35 (1.38) 47,7 23,1 (.91) 26,9 (1.06) 28,9 (1.14) 53,1 (2.09) 74,7 (2.94) 84,1 (3.31) Series M N P Q R S Straight Thread 4C*-03 70,9 (2.79) 4C*-06 95,2 (3.75) 4C* ,9 (4.25) 35 (1.38) 47,7 53,8 (2.12) 59,4 (2.34) 75,7 (2.98) 99,1 (3.90) 35 (1.38) 47,7 82,5 (3.25) 35 (1.38) 50,8 (2.00) 86,4 (3.40) 122,2 (4.81) 171,4 (6.75) 193,8 (7.63) T NPTF Thread 69, ,6 (3.49) 117, UNF-2B 3/8 2,7 (6) 39, ,8 (2.00) 68, Approx. Weight kg (lb) UN-2B 3/4 5,7 (12.5) UN-2B 1-1/4 12 (26.5) 14

15 Application Data, Ordering, and Service. Hydraulic fluids Valves can be used with anti-wear hydraulic oil, or automotive type crankcase oil (designations SC, SD, SE, SF, or SG) per SAE J183 JUN89. Fire-resistant fluids can also be used, but may require the use of special seals as explaned in the following Seals section. A fluid viscosity ranging between 32 cst (150 SUS) and 48,5 cst (225 SUS) at 38 C (100 F) is recommended. Seals Inline check valves have no elastomer seals, so they can be used with petroleum or fire-resistant fluids. Nitrile (Buna N) seals are standard in other Vickers check valves, except certain pilot operated models described below. These seals are suitable for use with petroleum and water-glycol fluids, and water-in-oil emulsions. Synthetic fire-resistant fluids require the use of Viton seals, which are identified in model codes by an F3 prefix. These seals are standard in pilot operated 4CS and 4CT models, so the prefix need not be added. (Viton is a registered trademark of E.I. DuPont Co.) Mounting position The mounting position of valves is not limited because of their spring closure construction. Port connections Straight-threaded or flanged O-ring connections are less likely to leak, compared to taper-threaded (NPT) connections, and are recommended. Fluid cleanliness Proper fluid condition is essential for long and satisfactory life of hydraulic components and systems. Hydraulic fluid must have the correct balance of cleanliness, materials and additives for protection against wear of components, elevated viscosity and inclusion of air. Essential information on the correct methods for treating hydraulic fluid is included in Vickers publication 561; Vickers Guide to Systemic Contamination Control, available from your local Vickers distributor or by contacting Vickers, Incorporated. Recommendations on filtration and the selection of products to control fluid condition are included in 561. Recommended cleanliness levels, using petroleum oil under common conditions, are based on the highest fluid pressure levels in the system and are coded in the chart below. Fluids other than petroleum, severe service cycles or temperature extremes are cause for adjustment of these cleanliness codes. See Vickers publication 561 for exact details. Cleanliness codes for petroleum oil usage System Pressure Level Product 2000 psi psi psi Vane pumps, fixed 20/18/15 19/17/14 18/16/13 Vane pumps, variable 18/16/14 17/15/13 Piston pumps, fixed 19/17/15 18/16/14 17/15/13 Piston pumps, variable 18/16/14 17/15/13 16/14/12 Directional valves 20/18/15 20/18/15 19/17/14 Check valves 20/18/15 20/18/15 20/18/15 Proportional valves 17/15/12 17/15/12 15/13/11 Servo valves 16/14/11 16/14/11 15/13/10 Pressure / Flow controls 19/17/14 19/17/14 19/17/14 Cylinders 20/18/15 20/18/15 20/18/15 Vane motors 20/18/15 19/17/14 18/16/13 Axial piston motors 19/17/14 18/16/13 17/15/12 Radial piston motors 20/18/14 19/17/13 18/16/13 Vickers products, as any components, will operate with apparent satisfaction in fluids with higher cleanliness codes than those described. Other manufacturers will often recommend levels above those specified. Experience has shown, however, that life of any hydraulic components is shortened in fluids with higher cleanliness codes than those listed below. These codes have been proven to provide a long trouble-free service life for the products shown, regardless of the manufacturer. Ordering Order each valve by complete model number to ensure size and cracking pressure are as required. If needed, a mounting subplate, and/or bolt kit, must be ordered separately: Example: One (1) 4CG-06-A-21 Valve One (1) RXGM-06SX-20 Subplate One (1) BKRX Bolt Kit Service information Refer to following parts drawings for service information: Series C2-8** C2S-8** C5G-805 C5G-815/825 DS8P1 DT8P1 4CG-03 4CG-06 4CG-10 4CS/4CT-03 4CS/4CT-06 4CS/4CT-10 Drawing I-0632-S I-3612-S I-3582-S I-3578-S I-0953-S I-0953-S I-3579-S I-3580-S I-3581-S I-3681-S I-3682-S I-3683-S 15

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